45643531 has 2 divisors, whose sum is σ = 45643532. Its totient is φ = 45643530.

The previous prime is 45643519. The next prime is 45643541. The reversal of 45643531 is 13534654.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 45643531 - 2⁹ = 45643019 is a prime.

It is a super-2 number, since 2×45643531² = 4166663844295922, which contains 22 as substring.

It is a junction number, because it is equal to n+sod(n) for n = 45643493 and 45643502.

It is not a weakly prime, because it can be changed into another prime (45643541) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 22821765 + 22821766.

It is an arithmetic number, because the mean of its divisors is an integer number (22821766).

Almost surely, 2^45643531 is an apocalyptic number.

45643531 is a deficient number, since it is larger than the sum of its proper divisors (1).

45643531 is an equidigital number, since it uses as much as digits as its factorization.

45643531 is an evil number, because the sum of its binary digits is even.

The product of its digits is 21600, while the sum is 31.

The square root of 45643531 is about 6755.9996299585. Note that the first 3 decimals coincide. The cubic root of 45643531 is about 357.3768457732.

The spelling of 45643531 in words is "forty-five million, six hundred forty-three thousand, five hundred thirty-one".